2. No party for first election. The party system in the U.S. made its appearance during Washington's first term as president.

3. Died in office.

4. Democratic-Republican with J. Q. Adams; Democratic with Jackson. Calhoun resigned in 1832 to become a U.S. senator.

5. Succeeded to presidency on death of president. Prior to the passage of the 25th Amendment (ratified Feb. 10, 1967), there were no provisions for filling a vacancy in the vice presidency. In the event of a vacancy, the president pro tempore took over most of the vice president's duties.

7. Nominated by Nixon on Oct. 12, 1973, under provisions of 25th Amendment. Confirmed by Congress on Dec. 6, 1973, and was sworn in same day. He became president Aug. 9, 1974, upon Nixon's resignation.

8. Nominated by Ford Aug. 20, 1974; confirmed by Congress on Dec. 19, 1974, and was sworn in same day.